THE FIRST FISSURE DETECTION CAR, AS BUILT FOR THE AMERICAN RAILWAY ASSOCIATION.

THE SMALL FLATBED TRUCK INFRONT OF THE CAB IS THE TEST UNIT WITH THE OPERATOR AND RECORDING EQUIPMENT IN THE ENCLOSE CAB AT THE REAR.

( This Photo is from a reprint of a paper titled TRANSVERSE FISSURE DETECTOR CAR byHarcourt C. Drake, presented at the winter convention of the A. I. E. E., New York, N. Y. January 26-30, 1931)